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Fact Sheet 2014–3056

Notice: This USGS Publication Supersedes FS 108-96

California’s Restless Giant—the Long Valley Caldera

By David P. Hill, Roy A. Bailey, James W. Hendley II, Peter H. Stauffer, and Mae Marcaida

Thumbnail of and link to report PDF (1 MB)Abstract

Scientists have monitored geologic unrest in the Long Valley, California, area since 1980. In that year, following a swarm of strong earthquakes, they discovered that the central part of the Long Valley Caldera had begun actively rising. Unrest in the area persists today. The U.S. Geological Survey (USGS) continues to provide the public and civil authorities with current information on the volcanic hazard at Long Valley and is prepared to give timely warnings of any impending eruption.

First posted August 19, 2014

For additional information, contact:
Volcano Science Center—Menlo Park
U.S. Geological Survey
345 Middlefield Road, MS 910
Menlo Park, CA 94025

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Suggested citation:

Hill, D.P., Bailey, R.A., Hendley, J.W., II, Stauffer, P.H., and Marcaida, M., 2014, California's restless giant—the Long Valley Caldera: U.S. Geological Survey Fact Sheet 2014–3056, 2 p.,

ISSN 2327–6916 (print)

ISSN 2327–6932 (online)

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